Horns JCWhitney.
They are compact enough to fit easily into any engine compartment. Shop for Replacement Horns. Siren Horns are ideal for emergency vehicles, police cars, fire engines and ambulances. Siren Horns include 110-decibel motor-driven Sirens that produce the blaring sound of police car and fire truck, 4-in-1 Sirens that combine the sounds of a police car, fire engine, ambulance and a truck air horn and 140-decibel Sirens that can be heard almost a mile away.